How do you get Pistons Out for Front Brake Calipers Options

[kbrunk1]

Haynes and Climer books say you clamp one side (one piston) then use air to push out the other side.

I have a small compressor. I am assuming you closed both bleed valves and then apply air to where the hydrolic line comes in.

When I do this I can not get the piston to come out.
Do you have to get a threaded fitting and then apply air pressure?
I was just pressing a "riggged tape tip nozzle" and most likely am not getting sufficient air pressure.

Right side caplider brakes seems to be fine (move in and out easily when clamped) and I was just going to put a kit in because it is so old. The Haynes book says to not split the caliper unless you have to.

The other front caliper seems to have a stuck piston because when clamping it it will not move. I am soaking in brake fluid and will see.....

Any help here?

[Eric_Shea]

For what you're up against, fluid will probably be the only answer. When using a fluid like grease or water, there will be no flying parts. Fluids don't compress so they usually just plop out of the bore without much fanfare. Watch the video and you can see how it's done:


https://www.youtube.com/watch?v=WxN_iFv3CB4


I don't recommend honing bores any more. This leaves a fresh steel against fresh steel surface. If the car sits for any period of time, you will have this problem all over again but worse.

In for a penny, in for a pound. I "always" recommend do it yourselfers find a local plating company and finish the job right. The plating process will clean up the caliper and add a protective layer of zinc back into the bore. Yellow dichromate is the stock color and the fasteners are black zinc.

E.

[kbrunk1]

For what you're up against, fluid will probably be the only answer. When using a fluid like grease or water, there will be no flying parts. Fluids don't compress so they usually just plop out of the bore without much fanfare. Watch the video and you can see how it's done:


https://www.youtube.com/watch?v=WxN_iFv3CB4


I don't recommend honing bores any more. This leaves a fresh steel against fresh steel surface. If the car sits for any period of time, you will have this problem all over again but worse.

In for a penny, in for a pound. I "always" recommend do it yourselfers find a local plating company and finish the job right. The plating process will clean up the caliper and add a protective layer of zinc back into the bore. Yellow dichromate is the stock color and the fasteners are black zinc.

E.

Eric - when you do this do you also yellow dichromate the piston?
Thanks